package ac.java.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5Util {

	static public String m32(String plainText) {
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(plainText.getBytes());
			byte b[] = md.digest();

			int i;

			StringBuffer buf = new StringBuffer("");
			for (int offset = 0; offset < b.length; offset++) {
				i = b[offset];
				if (i < 0)
					i += 256;
				if (i < 16)
					buf.append("0");
				buf.append(Integer.toHexString(i));
			}
			
			return buf.toString();
			
			// System.out.println("result: " + buf.toString());// 32位的加密
			// System.out.println("result: " + buf.toString().substring(8,
			// 24));// 16位的加密
			
			//return buf.toString().substring(8, 24);
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
			return null;
		}
	}
	
	static public String m16(String plainText) {
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(plainText.getBytes());
			byte b[] = md.digest();

			int i;

			StringBuffer buf = new StringBuffer("");
			for (int offset = 0; offset < b.length; offset++) {
				i = b[offset];
				if (i < 0)
					i += 256;
				if (i < 16)
					buf.append("0");
				buf.append(Integer.toHexString(i));
			}
			
			return buf.toString().substring(8, 24);
			
			// System.out.println("result: " + buf.toString());// 32位的加密
			// System.out.println("result: " + buf.toString().substring(8,
			// 24));// 16位的加密
			
			//return buf.toString().substring(8, 24);
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
			return null;
		}
	}
		

	public static void main(String agrs[]) {
		System.out.println(Md5Util.m32("123456"));
		System.out.println(Md5Util.m32("张三"));
	}
}
